20721428

素因数分解:

$2^2\times 7^1\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{151}}^1$

素因数の和:217

約数の個数: 72

約数和(自身を含む): 46730880

約数和(自身を除く): 26009452

約数列:

[1, 2, 4, 7, 13, 14, 26, 28, 29, 52, 58, 91, 116, 151, 169, 182, 203, 302, 338, 364, 377, 406, 604, 676, 754, 812, 1057, 1183, 1508, 1963, 2114, 2366, 2639, 3926, 4228, 4379, 4732, 4901, 5278, 7852, 8758, 9802, 10556, 13741, 17516, 19604, 25519, 27482, 30653, 34307, 51038, 54964, 56927, 61306, 68614, 102076, 113854, 122612, 137228, 178633, 227708, 357266, 398489, 714532, 740051, 796978, 1480102, 1593956, 2960204, 5180357, 10360714, 20721428]

約数ペア:

[(1, 20721428), (2, 10360714), (4, 5180357), (7, 2960204), (13, 1593956), (14, 1480102), (26, 796978), (28, 740051), (29, 714532), (52, 398489), (58, 357266), (91, 227708), (116, 178633), (151, 137228), (169, 122612), (182, 113854), (203, 102076), (302, 68614), (338, 61306), (364, 56927), (377, 54964), (406, 51038), (604, 34307), (676, 30653), (754, 27482), (812, 25519), (1057, 19604), (1183, 17516), (1508, 13741), (1963, 10556), (2114, 9802), (2366, 8758), (2639, 7852), (3926, 5278), (4228, 4901), (4379, 4732)]